Babanrao is an organic farmer growing ladyfingers in his field. What are the precautions he will take to control pests in his field?

I. Use of ladybird and dragonflies to control butterfly caterpillars.

II. Use of Nucleopolyhedrovirus to control arthropods.

III. Use of Bacillus thuringiensis to control butterfly caterpillars.

IV. Use of Trichoderma to control arthropods.

• A

  $\mathrm{I},\mathrm{ }\mathrm{I}\mathrm{I}\mathrm{I},$
• Correct answer
  B

  $\mathrm{I}\mathrm{I},\mathrm{ }\mathrm{I}\mathrm{I}\mathrm{I}$
• C

  $\mathrm{I}\mathrm{I}\mathrm{I},\mathrm{ }\mathrm{I}\mathrm{V}$
• D

  $\mathrm{I},\mathrm{ }\mathrm{I}\mathrm{V}$

Hence, the correct answer is option: 'B'.